lesson 3 Standard Methods of Input

Kafui A. Prebbie ­[email protected] 1 This lesson includes the following sections: • The Keyboard • The Mouse • Variants of the Mouse

Kafui A. Prebbie ­[email protected] 2 The Keyboard

• The Standard Keyboard Layout

• Ergonomic Keyboards

• How a Keyboard Works

Kafui A. Prebbie ­[email protected] 3 The Keyboard ­ Standard Keyboard Layout

• A standard computer keyboard has about 100 keys.

• Most keyboards use the QWERTY layout, named for the first six keys in the top row of letters.

Kafui A. Prebbie ­[email protected] 4 The Keyboard ­ Standard Keyboard Layout

Most keyboards have keys arranged in five groups:

1. Alphanumeric keys

2. Numeric keypad

3. Function keys

4. Modifier keys

5. Cursor­movement keys

Kafui A. Prebbie ­[email protected] 5 ACADEMIC RECORDS Password * * * * * ENTER Invalid Password

Kafui A. Prebbie ­[email protected] 6 The Keyboard ­ Ergonomic Keyboards

• Long periods of keyboard use can cause injuries.

• An ergonomically correct keyboard can help you avoid injuries.

• You also can avoid injuries by adopting correct keyboarding practices.

Kafui A. Prebbie ­[email protected] 7 The Keyboard ­ How a Keyboard Works

When you press a key:

• The keyboard controller detects the keystroke.

• The controller places a scan code in the keyboard buffer, indicating which key was pressed.

• The keyboard sends the computer an interrupt request, telling the CPU to accept the keystroke.

Kafui A. Prebbie ­[email protected] 8 Kafui A. Prebbie ­[email protected] 9 The Mouse

• What is a Mouse?

• Mouse Techniques

Kafui A. Prebbie ­[email protected] 10 The Mouse ­ What is a Mouse?

• The mouse is a pointing device. You use it to move a graphical pointer on the screen.

• The mouse can be used to issue commands, draw, and perform other types of input tasks.

Kafui A. Prebbie ­[email protected] 11 The Mouse ­ Mouse Techniques

Using the mouse involves five techniques: 1. Pointing; Move the mouse to move the on­screen pointer.

3. Clicking; Press and release the left mouse button once.

6. Double­clicking; Press and release the left mouse button twice.

9. Dragging; Hold down the left mouse button as you move the pointer.

• Right­clicking; Press and release the right mouse button.Kafui A. Prebbie ­[email protected] 12 Variants of the Mouse

• Trackballs

• Trackpads

• Integrated Pointed Devices

Kafui A. Prebbie ­[email protected] 13 Variants of the Mouse ­ Trackballs

• A trackball is like a mouse turned upside­down. • Use your thumb to move the exposed ball and your fingers to press the buttons.

Many styles of trackball are available.

Kafui A. Prebbie ­[email protected] 14 Variants of the Mouse ­ Trackpads

• A trackpad is a touch­sensitive pad that provides the same functionality as a mouse.

• To use a trackpad, you glide your finger across its surface.

• Trackpads provide a set of buttons that function like mouse buttons.

Kafui A. Prebbie ­[email protected] 15 Kafui A. Prebbie ­[email protected] 16 Variants of the Mouse­ Integrated Pointing Devices

• An integrated pointing device is a small joystick built into the keyboard.

• To use an integrated pointing device, you move the joystick.

• These devices provide a set of buttons that function like mouse buttons

Kafui A. Prebbie ­[email protected] 17 Kafui A. Prebbie ­[email protected] 18 lesson 3 Review

• Identify the five key groups on a standard computer keyboard.

• Describe the purpose of a mouse and the role it plays in computing.

• Identify the five essential techniques for using a mouse.

• Identify three common variants of the mouse.

Kafui A. Prebbie ­[email protected] 19